As often is the way with quotes and sayings they get changed along the way of history
Can You Overdose on Vitamin B12
After your injection, avoid: Strenuous exercise for a few hours Rubbing or massaging the injection site Alcohol, which can interfere with absorption Most patients resume normal activities immediately, but its always best to rest a bit after your visit
B12 Injections are considered safe, even in patients without a notable deficiency
The muscle is obviously deeper than your subcutaneous tissue (you can see the image above for reference)
A 2017 meta-analysis of data from 15 trials, including more than 71,000 participants at risk of or with existing CVD, showed that B-vitamin supplementation had no significant effect on risk of myocardial infarction (heart attack) or all-cause mortality but reduced risk of stroke by 10% (RR, 0.90